good news in mid july, police found out that just four days after brittany vanished, a cop stopped her toyota on a highway out west, but brittany wasn't driving. joe was. >> july 11th, roberts is actually stopped by police in wyoming for speeding. >> the bad news? that cop stopped the car before the alert went out. he wasn't looking for the car or brittany or anybody. he said he didn't recall seeing a passenger but then he wasn't looking for one. >> they let him go with a warning. >> and now that car and whoever was in it was long gone. but that stop triggered a serious effort to find joe roberts. >> it was after that that they had released an arrest warrant for him with grand theft charges. >> so the investigation took a turn. the police, hoping that finding roberts would lead to finding brittany. once again, her family went to the public for help. >> what we really need is for the broadest possible audience of people to be looking for joseph roberts. that's the linchpin. that's the only way we're going to get any answers. >> the police went on tv, too, hoping to raise public awareness. >> w